According to FTK's documentation, "The image created will include only logical files; it will not include any file system metadata, deleted files, unallocated space, etc. It cannot be converted to a sector image (such as .E01) because it does not store sector information. Although logical images can be examined in FTK Imager 2.x or newer, they are not supported by the current version of FTK. Logical image support will be added to FTK in a future release."